Question about 1999 GMC Yukon
Need to get caught up on Preventative Maintenance
AFTER you road test with professional scan tool & look
Spark Plugs are not changed every 3 years
Oxygen Sensors are in the motor over 100,000 miles
Egr issues ?
OBD Codes in the systems?
Worn Out TPS Sensor ?
Fuel Pressure ?
Worn Out Exhaust Converter-- for sure-- if original-thus loss
of fuel control
DO NOT THROW Parts at it
Have it tested & find a problem
Posted on Nov 23, 2014
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Posted on Jan 02, 2017
I have seen this type of problem before, this sounds like the engine is not getting the correct amount of fuel pressure it needs as you accel.the first thing is to remove the fuel filter and replace it, take the old filter and blow into it, this will tell you if its restricked. the next step will be to check fuel pressure, you will need a gauge for this test, hook up gauge at valve on the injector rail, take caution wear safty glasses as fuel is under pressure and will spary out a little as you connect line for the gauge to fuel injector rail valve, you will run the engine and also step on gas pedal as you watch the pressure, i would rev the engine to around 3000rpms and hold it to see if engine tries to stall or buck when it begins to act up look at the gauge and if the pressure drops as it starts to act up then the fuelpump is bad. its not able to keep up the pressure. start there good day.
Posted on Oct 20, 2011
Check the fuel pressure regulator. It is on the drivers side, front of the engine near the throttle body. Remove the vacuum hose and see if fuel comes out of the nipple. If it does than the regulator needs to be replaced.
If the regulator is fine than you will need to check fuel pressure with a gauge. If fuel pressure drops as soon as you shut off the car than the fuel pump is likely bad.
Posted on Jul 26, 2012
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